Electric cut-out.



No. 818,291. .PATENTBD APR. 17, 1906.

R. H. READ.

ELECTRIC CUT0UT. APPLICATION FILED SEPT. 2s. 1904.

Witnesses. l Inventor: M.. 7g4/., Robert N.- Read.

@Mgmjg UNTE) No. Sismi.

Specification Letters inattesi..

mesme@ mi it', ieee,

Application llad September 2B, 3.90%. ierliil iin. 225,96?.

T0 all whom t may concern;

it known that i, ROBERT iii. READ, e citize 'lof the United States, residing it Sci `r1- ectec county of Schenectady, State of New Ycrkfhave invented certain new end useful Improvements in Eiectric Cut-Outs, of which the oiic'wiig is a s' ecicntion.

MW invention re etes to electric cut-outs of the se type; enti its object is to provide e iiovei form of fuse to operi eicciric circuits' of high voltage with certainty emi without tiemege to the fuse structure.

In e former pri-tent, No. 716,475, issued to me December 23, i902, I lieve descrihcci c novel form or' switch which is particulsriy ci fective iii ruptiiring currents of high poten tial and which involves the employment of hollow er tubular contacts, through which is driven at the momerit oi separetion e strong blast of air which acts to stretch out 'within the contacts the are foiiried between them, so that the are is quickly broken.

My present invention consists in providing such it set or contacts piaceri in en iriciosed chamber with the fuse with means responsive to a rise of pressure in the chamber operetivelv connected to one of the contacts, so that the fessure produced in the chamber by the vo atilieittioii of the fuse :iets both to produce the sepsrotiori of the tubiiir coriteets ond to rieuse e blast oi stir the tubes upon 'their separation, so as to the arc.

Another Seeture of my invention consists in arrerigirig the fuse as e ping-fuse :iriiipted to he inserted and 1withdrawn conveiiicntiy, with cerineotions within the casino for piecirig the fuse iii series with the tu mier coritzicts when it is inserti-ii in piece.

My .invention will heet he imriereoeti hij rciercnce to the mccniimiijging driiwiiige, which Figure i Ashows si cross-sectional View of e fuse amm ed in accordance with my inveii; tion, und l'tgigi 2 shows e same.

.in Fig. A represents e. cyliricii'icei casing irovided at its ends with the heads a and he cesing is prefemhl lined'with insulating imiteri'el,.as shown. i5 represents a piston which ismoviiblc viithin the casing and which engagement with modiiei form `ofjahe is made partij or whoiiy of insiiieting maite riai, es indicated. This 'pistes B carries is. sleeve i?, extei'iiiing through the heini a', wifoh forms e. guide oi inside the siecife 35 is cerrieii a coriiiiictiiiguhe il, which is provided et its outer eri i mirar-i s?, shown. The piston is iioririeiij iii the positieri shown hy the spire; com pression-spring In this 'cositicn ci? thai c piston the coiiiiiictiiigmiiie pressed engagement with the tube l?, which is supportati from the opos and tiierehom, es i' l -iric with the f i. i ioriris one teriiiiiiii for the nuse "oro" ci'ftfiiici, es shown, consists. ei" e, strip oi'P iisibie 'metsi F, provid-sd. st its @mls with the termine-i cciii tests f snij". These tcrminei contacts are corrieri en insuiatingiod i, which. 'r'or cori vcriierice is prot'iiie with s.. tenda El, by ineens o' 'hich the fusible s" A sercri piece arid Witiirirofvri for i. 'Gi

The coimttcrmimlj erigsges the img o?, the stationery 'Lehe E, while tno ottici" ccc teC-tefiriirizii j engages the 'terminati G.

The tube has en iiisiiiea-ingccvciing to werent im ere springing to it 'from his@ i?. The heed a is provided with im outiet e", isterin'r with fue interior passage of stef-Lion- .firv tuee 1.

'i oiieistiori is ioiiows: current enters et the terminal .c emi meses through ih@ 'mbe il, tube inge?, fuse-tenniimif, fuse-siasi@ F, fuse-termimeij and out at teriiiiiiei hice if im overl-ced @come mi the circuit the fiisihie strip wiii be hiowri enti hy its voistiiizsion xviii produce eri iricrease ir; pressure within the casing A, which wiii drive piston E iiockwiirii, commessing spring E vi'ifciiiiizwrizig; the 'Luhe C trom its he stetioiisry tiihe il. A second break wili thus be produced in the circuit in scrive with the fusihie strip F, and the rcssiire within the iiiclosmi, chamber, whic accumulates until the piston moves, produces e rush of cia' mid hot reses into the tubos, which stretches out wiiiiiii the iiihes the ure formed between them imiii the im: is broken either in the iubcs or at the fuse. it is evident that the fuse is reliablein ncion,

and since the crc is almost instantly Qxtinl IOC) guished no damage to the fuse structure is l ber,a fuse contained therein,a movable memproduced when the fusible strip is blown.

Fig. 2 shows a modification in which one tube is dispensed with and one fuse-contact terminal f serves, with the movable tube C, to produce the second break in the circuit. The operation is the same as has been already described, and this modification requires no further explanation Here the action is identical in principle with the design of Fig. l, exce t that the stretching of the are obtains o y at one point. Although I have shown a fuse structure in which the pressure generated by the volatilization of the fuse metal acts directly upon a pis on carried b the movable contact to reduce the secondv reak in the circuit, it is o vious that other equivalent arrangements may be employed. Other variations may be made in the construction and arrangement of parts, and I aim in the appended claims tov cover all modifications' which are within the scope of my invention.

What I claim as new, and desire to secure' by Letters Patent of the United States, is-

1. In a cut-out for electric circuits, a cli'amber, a fuse contained therein, a vmovable member subjected to the pressure generated in said chamber when the fuse blows, a movable contactwpitliin said chamber operatively connected to`said member, a stationary contact, and means for holding said movable contact normally in engagement with said stationary contact, said contacts being included in circuit with said fuse.

2. In a eut-out for electric circuits, a chamber, a fuse contained therein, a movable contact within said chamber in circuit with said fuse, and means responsive to a rise of pressure in said chamber for moving said contact.

3. In a cut-out for electric circuits, a chamber, a fuse contained therein, a movable contact within said chamber in circuit with said use, a movable member subjected to the igessure generated, in said chamber when the iiise blows, and operative connections between said member and said contact.

4. In a cut-out for electric circuits, a chamber, a fuse contained therein, a movable contact in circuit with said fuse, and means reh sponsive to a rise of pressure insaid chamber for moving said contact, said contact'being arranged when moved to opena passage from said chamber to atmosphere. y

5. In a cut-outl for electric circuits, a cham ber, a fuse contained therein, a movable contact in circuit with said fuse, a movable member subjected `t'o thepressurel generated in said chamber /when the fuse blows, and operative connections between said member and said contact, said contact being arranged when moved to open a passage from said chamber'to atnios ihere.

(j. In a cut-out or electric circuits, a chamber subjected to the pressure Generated in said chamber when the fuse blows, a movable contact operatively connected to said member, a stationary contact, and means for holding said movable contact normally in engagement with said stationary contact, said contacts being arranged when separated to open a passage from said chamber to atmosphere.

7. In a cut-out for electric circuits, a chamber, a fuse contained therein, a movable member subjected to the pressure generated in said chamber when the fuse blows, and a movable tubular contact in circuit with said fusel and operatively connected to said member and adapted when moved to oier apassage from said chamber to atmosphere.

8. In a cut-out for electric circuits, a chamber, a fuse contained therein, a contact in circujt with said fuse, a tubular movable contact at one end open to atmosphere and at the other end normally closed by the companion contact, a movable member subjected to the ressure generated in said chamber when the use blows, and operative connections between said member and said movable contact. v 9. In a cut-out for electric cireuitsa chamber, a fuse contained therein, a stationary contact in circuit with said fuse, a tubular movable contact extending through said casing and open at its outer end to atniosphere, means for holding the inner end of said movable contact normally in engagement with said stationary contact, a movable member subjected to the pressure generated in said chamber when the fuse blows, and operative connections between said member and said movable contact.

10. In aout-out for electric circuits, a chamber, a fuse-contained therein, a tubular convtact yieldingly mounted in said chamber and connected in series with said fuse, and means responsive to a rise of pressure in said chamber operatively connected to said tubular contact.

11. A fusible cut-out comprising a closed chamber, a plug-fuse adapted to be inserted and withdrawn from said chamber, and means res ionsive to a rise of pressure in said chamber ier breaking the circuit in which said fuse is connected when inserted.

12. A fusible cut-out comprising a closed chamber, a plug-fuse adapted to be introduced and withdrawn from the chamber, a tubular electrode'yieldingly mounted in said chamber adapted to be moved by the pressure generated in the chamber when the fuse blows and to provide a discharge-path for the gases, and connections foi'l coupling'the electrode and fuse in series ivhen the fuse is inserted.

13. A fusible cut-out leomprising a closed IOO chamber, ap1ug-fuse adapted to be inserted Y in witnessjwheref I have hereunt se my' and Withdawn from szid cha..1ub \r, a tubular hund this 22d day of Spcmber, 1904. contact in circuit with sind fuse when insorti i n l l n f` ed andadaptedwhen movedtooffera, nssuge RvBhRl H hLAL j, 'from said chamber to atmosphere, an(i)lneals Witnesses: v

responsive t0 a rise of ressure within said 1 BEJAMN B. HULLy chamber for moving suini) Contact. HELEN SWORD. 

